EP2628008A1 - Procédés et trousses pour la détection de cellules tumorales circulantes chez des patients pancréatiques à l'aide de réactifs polyspécifiques de capture et de détection de cocktail - Google Patents

Procédés et trousses pour la détection de cellules tumorales circulantes chez des patients pancréatiques à l'aide de réactifs polyspécifiques de capture et de détection de cocktail

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Publication number
EP2628008A1
EP2628008A1 EP11778732.5A EP11778732A EP2628008A1 EP 2628008 A1 EP2628008 A1 EP 2628008A1 EP 11778732 A EP11778732 A EP 11778732A EP 2628008 A1 EP2628008 A1 EP 2628008A1
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Prior art keywords
cells
cell
sample
cancer
rare
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EP11778732.5A
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German (de)
English (en)
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EP2628008B1 (fr
Inventor
Galla Chandra Rao
Mark Carle Connelly
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Janssen Diagnostics LLC
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Janssen Diagnostics LLC
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
    • G01N33/57484—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites
    • G01N33/57492—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites involving compounds localized on the membrane of tumor or cancer cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
    • G01N33/54313—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being characterised by its particulate form
    • G01N33/54326—Magnetic particles
    • G01N33/54333—Modification of conditions of immunological binding reaction, e.g. use of more than one type of particle, use of chemical agents to improve binding, choice of incubation time or application of magnetic field during binding reaction

Definitions

  • This invention relates to the fields of oncology and diagnostic testing.
  • the invention is useful for cancer screening, staging, monitoring for chemotherapy treatment responses, cancer recurrence or the like. More specifically, the present invention provides reagents, methods and test kits which facilitate analysis and enumeration of tumor cells, or other rare cells isolated from biological samples.
  • CTCs circulating tumor cells
  • the original CellSearch CTC assay uses anti-EpCAM conjugated to paramagnetic nano particles (EpCAM ferrof uid) to capture CTCs.
  • EpCAM ferrof uid anti-cytokeratin antibody
  • CK8, 18 and 19 anti-cytokeratin antibody
  • TPC tumor progenitor cells
  • EMT Epithelial Mesenchymal Transition Cells
  • CTC capture depends on the expression of EpCAM on CTCs; because CTC capture has been limited to a single capture antigen.
  • EpCAM antigen may be down regulated or negative in some CTCs. In such cases, the CTC will not be captured by EpCAM ferrofluid and will result in zero CTCs in the assay.
  • CTCs are captured by they are not detected due to absence of cytokeratin markers used in the assay. As a consequence, although many CTCs are successfully captured and detected by the current technology, it is possible that there are present in the blood of cancer patients CTCs that are not detected because they fail to express the markers used in the current assay.
  • Magnetic particles are well known in the art, as is their use in immune and other bio-specific affinity reactions. See, for example, US Patent No. 4,554,088 and Immunoassays for Clinical Chemistry, pp. 147-162, Hunter et al. eds., Churchill Livingston, Edinburgh (1983). Generally, any material which facilitates magnetic or gravitational separation may be employed for this purpose. However, it has become clear that magnetic separation means are the method of choice.
  • Magnetic particles can be classified on the basis of size as large (1.5 to about 50 microns), small (0.7-1.5 microns), or colloidal ( ⁇ 200nm), which are also referred to as nanoparticles.
  • the latter which are also known as ferrofluids or ferrofluid-like materials and have many of the properties of classical ferrofluids, are sometimes referred to herein as colloidal, superparamagnetic particles.
  • Small magnetic particles of the type described above are quite useful in analyses involving bio-specific affinity reactions, as they are conveniently coated with biofunctional polymers (e.g., proteins), provide very high surface areas and give reasonable reaction kinetics.
  • biofunctional polymers e.g., proteins
  • Magnetic particles ranging from 0.7-1.5 microns have been described in the patent literature, including, by way of example, US Patent Nos. 3,970,518; 4,018,886; 4,230,685; 4,267,234; 4,452,773; 4,554,088; and 4,659,678. Certain of these particles are disclosed to be useful solid supports for immunological reagents.
  • large magnetic particles can also exhibit superparamagnetic behavior.
  • Typical of such materials are those described by Ugelstad in US Patent No.4, 654267 and manufactured by Dynal, (Oslo, Norway).
  • the Ugelstad process involves the synthesis of polymer particles which are caused to swell and magnetite crystals are embedded in the swelled particles.
  • Other materials in the same size range are prepared by synthesizing the polymer particle in the presence of dispersed magnetite crystals. This results in the trapping of magnetite crystals in a polymer matrix, thus making the resultant materials magnetic.
  • the resultant particles have superparamagnetic behavior, which is manifested by the ability to disperse readily upon removal of the magnetic field.
  • these materials are readily separated with simple laboratory magnetics because of the mass of magnetic material per particle.
  • separations are effected in gradients from as low as a few hundred gauss/cm on up to about 1.5 kilogauss/cm.
  • Colloidal magnetic particles (below approximately 200nm),on the other hand, require substantially higher magnetic gradients because of their diffusion energy, small magnetic mass per particle and Stokes drag.
  • Magnetic separation techniques are known wherein a magnetic field is applied to a fluid medium in order to separate ferromagnetic bodies from the fluid medium.
  • HGMS high-gradient magnetic separation
  • the gradient of the magnetic field i.e., the spatial derivative, exerts a greater influence upon the behavior of the suspended particles than is exerted by the strength of the field at a given point.
  • HGMS systems can be divided into two broad categories.
  • One such category includes magnetic separation systems which employ a magnetic circuit that is entirely situated externally to a separation chamber or vessel. Examples of such external separators are described in US Pat. No. 5,186,827 to Liberti et al.
  • the requisite magnetic field gradient is produced by positioning permanent magnets around the periphery of a non-magnetic container such that the like poles of the magnets are in a field- opposing configuration.
  • the extent of the magnetic field gradient within the test medium that may be obtained in such a system is limited by the strength of the magnets and the separation distance between the magnets. Hence, there is a finite limit to gradients that can be obtained with external gradient systems.
  • HGMS separator utilizes a ferromagnetic collection structure that is disposed within the test medium in order to 1) intensify an applied magnetic field and 2) produce a magnetic field gradient within the test medium.
  • fine steel wool or gauze is packed within a column that is situated adjacent to a magnet.
  • the applied magnetic field is concentrated in the vicinity of the steel wires so that suspended magnetic particles will be attracted toward, and adhere to, the surfaces of the wires.
  • the gradient produced on such wires is inversely proportional to the wire diameter, such that magnetic reach decreases with increasing diameter. Hence, very high gradients can be generated.
  • HGMS approaches using external gradients for cell separation provide a number of conveniences.
  • simple laboratory containers such as test tubes, centrifuge tubes or even vacutainers (used for blood collection) can be employed.
  • external gradients are of the kind that produce monolayers of separated cells, as is the case with
  • CD 34 + cells magnetically labeled CD 34 + cells
  • a 15 ml conical test tube may be employed as the separation vessel in an appropriate quadrupole magnetic device. Starting with 15 mis of solution, a first separation is performed, and the recovered cells are resuspended in 3 mis. A second wash/separation is then performed and the isolated cells resuspended in a final volume of 200 ul.
  • CD 34 + cells can effectively be resuspended in a volume of 200 ⁇ .
  • the efficiency with which magnetic separations can be done and the recovery and purity of magnetically labeled cells will depend on many factors. These include such considerations as the number of cells being separated, the receptor density of such cells, the magnetic load per cell, the non-specific binding (NSB) of the magnetic material, the technique employed, the nature of the vessel, the nature of the vessel surface, the viscosity of the medium and the magnetic separation device employed. If the level of non-specific binding of a system is substantially constant, as is usually the case, then as the target population decreases so will the purity. As an example, a system with 0.8 % NSB that recovers 80% of a population which is at 0.25% in the original mixture will have a purity of 25%.
  • high gradient magnetic separation with an external field device employing highly magnetic, low non-specific binding, colloidal magnetic particles is the method of choice for separating a cell subset of interest from a mixed population of eukaryotic cells, particularly if the subset of interest comprises but a small fraction of the entire population.
  • Such materials because of their diffusive properties, readily find and magnetically label rare events, such as tumor cells in blood.
  • Such separation generally relies upon the identification of cell surface antigens that are unique to a specific cell subset of interest, which in the case of tumor cells, can be tumor antigens to which appropriate monoclonal antibody conjugated ferrofluids can be targeted.
  • determinants on classes of cells such as epithelial cells, which are normally not found in blood, can provide an appropriate receptor.
  • colloidal magnetic materials for such separations, providing an appropriate magnetic loading can be achieved. With appropriate loading, a sufficient force is exerted on a cell such that isolation can be achieved even in a media as viscous as that of moderately diluted whole blood.
  • colloidal magnetic materials below about 200 nanometers will exhibit Brownian motion which markedly enhances their ability to collide with and magnetically label rare cells. This is demonstrated in US Patent No. 5,541,072 where results of very efficient tumor cell purging experiments are described employing colloidal magnetic particles or ferrofluids having a mean diameter of 100 nm.
  • colloidal materials having a particle size at or below this size range do not generally interfere with examination of cells. Cells so retrieved can be examined by flow cytometry, laser scanning microscopy, or by microscopy employing visible or fluorescent techniques.
  • the present invention provides a rapid and efficient screening method for the characterization of not only tumor cells, but also rare cells, or other biological entities from biological samples.
  • the method of the invention provides highly sensitive analytical techniques which enable efficient enrichment for entities of interest. This two stage methodology which ensures enrichment of target bioentities while eliminating a substantial amount of debris and other interfering substances prior to analysis, allows for examination of sample sizes which would otherwise be impractical.
  • the method described herein combines elements of
  • the method of the invention enables assaying whole blood for cancer staging, monitoring and screening.
  • the sensitive nature of the assay facilitates the detection of residual disease, thus making it possible to monitor for cancer recurrence.
  • the present invention incorporates a method to conjugate different antibodies to the same ferrofluid. This has the effect of making the ferrofluid bi-, tri, or polyspecific with respect to the antigens that the ferrofluid will bind.
  • the multiple antibodies present on the same ferrofluid do not appear to block or otherwise interfere with each other.
  • Such ferrofluids have the highly desirable effect of being able to bind specifically to more than one type of cell, enabling the ability to capture CTCs that have low EpCAM expression, but high expression of other tumor markers;
  • a biological specimen which comprises a mixed cell population suspected of containing the rare cell of interest is obtained from a patient.
  • An immunomagnetic sample is then prepared by mixing the biological specimen with (i) magnetic particles which are coupled to a biospecific ligand specifically reactive with a rare cell determinant or a class of determinants different than those found on blood cells, to the substantial exclusion of other sample components, and (ii) at least one biospecific reagent which labels rare cells.
  • the resulting immunomagnetic sample is subjected to a magnetic field which is effective to separate the sample into an unlabeled fraction and a labeled, magnetic fraction including the rare cell of interest, if any is present in the specimen.
  • the cell population so isolated is then analyzed to determine the presence and number of rare cells.
  • the particles used in this method are colloidal nanoparticles.
  • the present invention allows for an improved detection of CTCs in pancreatic cancer patients.
  • polyspecific capture and detection reagents instead of the anti-EpCAM only reagents, polyspecific reagents such as, but not limited to, anti-EpCAM used as controls together with several other antibodies which recognize different antigens on CTCs are used to detect circulating cancer cells, previously undetected in the blood of patients.
  • the capture reagent is referred to as polyspecific capture reagent as it recognizes several antigens.
  • the CTC capture does not depend on EpCAM antigen alone and CTCs are captured even if the EpCAM antigen is not expressed provided other antigens selected for the capture are present on CTCs.
  • the ability to create polyspecific ferrofluids that have sufficient binding capacity, low nonspecific binding, and no cross blocking of the antibodies enables the capture of all the various types of CTCs; along with the use of an appropriately specific detection cocktail of antibodies.
  • a cocktail of antibodies specific for CTCs instead of a single antibody are conjugated to ferrofluid for the capture to minimize CTC capture dependence on a single target.
  • additional antibodies for the detection are used to cover a more broad range of antigens.
  • (B) shows the average percentage positive population of four cell lines for target antigen expression.
  • Figure 2 shows staining intensity of four cell lines as a function of intracellular target antigen expression.
  • B shows the average percentage positive population of four cell lines for target antigen expression.
  • Figure 3 (A) shows the recovery of spiked CAPAN1 tumor cells with different kit
  • (B) shows the recovery of spiked BxPC3 tumor cells with different kit configurations.
  • the present invention provides compositions, methods and kits for the rapid and efficient isolation of rare target bioentities from biological samples using polyspecific ferro fluids.
  • the methods described may be used effectively to isolate and characterize tumor cells present in a blood sample while at the same time minimizing the selection of non-specifically bound cells.
  • rare cell assays are further improved upon from the single target molecule used previously.
  • This modification improves the capture and detection of rare cells such as, but not limited to, pancreatic CTCs.
  • the non-epithelial markers such as mesenchymal markers (n-cadherin) can be used in conjunction with epithelial markers to capture both epithelial and mesenchymal tumor cells.
  • the present invention enables the simultaneous detection of different populations of rare cells, such as CTCs and different populations of tumor cells.
  • target bioentities refers to a wide variety of materials of biological or medical interest. Examples include hormones, proteins, peptides, lectins, oligonucleotides, drugs, chemical substances, nucleic acid molecules, (e.g., R A and/or DNA) and particulate analytes of biological origin, which include bioparticles such as cells, viruses, bacteria and the like.
  • nucleic acid molecules e.g., R A and/or DNA
  • particulate analytes of biological origin which include bioparticles such as cells, viruses, bacteria and the like.
  • rare cells such as fetal cells in maternal circulation, or circulating cancer cells may be efficiently isolated from non-target cells and/or other bioentities, using the compositions, methods and kits of the present invention.
  • biological specimen includes, without limitation, cell-containing bodily, fluids, peripheral blood, tissue homogenates, nipple aspirates, and any other source of rare cells that is obtainable from a human subject.
  • An exemplary tissue homogenate may be obtained from the sentinel node in a breast cancer patient.
  • determinant when used in reference to any of the foregoing target bioentities, may be specifically bound by a biospecific ligand or a biospecific reagent, and refers to that portion of the target bioentity involved in, and responsible for, selective binding to a specific binding substance, the presence of which is required for selective binding to occur. In fundamental terms, determinants are molecular contact regions on target bioentities that are recognized by receptors in specific binding pair reactions.
  • binding pair includes antigen-antibody, receptor-hormone, receptor-ligand, agonist-antagonist, lectin-carbohydrate, nucleic acid (R A or DNA) hybridizing sequences, Fc receptor or mouse IgG-protein A, avidin-biotin, streptavidin-biotin and virus-receptor interactions.
  • R A or DNA nucleic acid
  • antibody includes immunoglobulins, monoclonal or polyclonal antibodies, immunoreactive immunoglobulin fragments, and single chain antibodies. Also contemplated for use in the invention are peptides, oligonucleotides or a combination thereof which specifically recognize determinants with specificity similar to traditionally generated antibodies.
  • detectably label is used to herein to refer to any substance whose detection or measurement, either directly or indirectly, by physical or chemical means, is indicative of the presence of the target bioentity in the test sample.
  • useful detectable labels include, but are not limited to the following: molecules or ions directly or indirectly detectable based on light absorbance, fluorescence, reflectance, light scatter, phosphorescence, or luminescence properties; molecules or ions detectable by their radioactive properties; molecules or ions detectable by their nuclear magnetic resonance or paramagnetic properties. Included among the group of molecules indirectly detectable based on light absorbance or fluorescence, for example, are various enzymes which cause appropriate substrates to convert, e.g., from non-light absorbing to light absorbing molecules, or from non- fluorescent to fluorescent molecules. The phrase "to the substantial exclusion of refers to the specificity of the binding reaction between the biospecific ligand or biospecific reagent and its corresponding target determinant.
  • Biospecific ligands and reagents have specific binding activity for their target determinant yet may also exhibit a low level of non-specific binding to other sample components.
  • the term "early stage cancer” as used herein refers to those cancers which have been clinically determined to be organ-confined. Also included are tumors too small to be detected by conventional methods such as mammography for breast cancer patients, or X-rays for lung cancer patients.
  • the term “enrichment” as used herein refers to the enrichment of mononuclear cells from a biological sample. In cases where peripheral blood is used as the starting materials, red cells are not counted when assessing the extent of enrichment.
  • the preferred magnetic particles for use in carrying out this invention are particles that behave as colloids.
  • Such particles are characterized by their sub-micron particle size, which is generally less than about 200 nanometers (nm) (0.20 microns), and their stability to gravitational separation from solution for extended periods of time. In addition to the many other advantages, this size range makes them essentially invisible to analytical techniques commonly applied to cell analysis. Particles within the range of 90-150 nm and having between 70-90% magnetic mass are contemplated for use in the present invention.
  • Suitable magnetic particles are composed of a crystalline core of superparamagnetic material surrounded by molecules which are bonded, e.g., physically absorbed or covalently attached, to the magnetic core and which confer stabilizing colloidal properties.
  • the coating material should preferably be applied in an amount effective to prevent non specific interactions between biological macromolecules found in the sample and the magnetic cores.
  • biological macromolecules may include sialic acid residues on the surface of non-target cells, lectins, glyproteins and other membrane components.
  • the material should contain as much magnetic mass/nanoparticle as possible.
  • the size of the magnetic crystals comprising the core is sufficiently small that they do not contain a complete magnetic domain.
  • the size of the nanoparticles is sufficiently small such that their Brownian energy exceeds their magnetic moment. As a consequence, North Pole, South Pole alignment and subsequent mutual attraction/repulsion of these colloidal magnetic particles does not appear to occur even in moderately strong magnetic fields, contributing to their solution stability.
  • Magnetic particles should be separable in high magnetic gradient external field separators. That characteristic facilitates sample handling and provides economic advantages over the more complicated internal gradient columns loaded with ferromagnetic beads or steel wool.
  • Magnetic particles having the above-described properties can be prepared by modification of base materials described in U.S. Patents Nos. 4,795,698, 5,597,531 and 5,698,271. Their preparation from those base materials is described below.
  • the enumeration of circulating epithelial cells in blood using the methods and compositions of the present invention is achieved by immunomagnetic selection (enrichment) of epithelial cells from blood followed by the analysis of the samples by multiparameter flowcytometry.
  • the immunomagnetic sample preparation is important for reducing sample volume and obtaining a 10 4 fold enrichment of the target (epithelial) cells.
  • the reagents used for the multiparameter flowcytometric analysis are optimized such that target cells are located in a unique position in the multidimensional space created by the listmode acquisition of two lightscatter and three fluorescence parameters.
  • leucocyte antigen an antibody against the pan- leucocyte antigen, CD45 to identify leucocytes (non-tumor cells); a cell type specific or nucleic acid dye which allows exclusion of residual red blood cells, platelets and other non-nucleated events; and 3) a biospecific reagent or antibody directed against cytokeratin or an antibody having specificity for an EpCAM epitope which differs from that used to immunomagnetically select the cells.
  • Capture Targets include 1) an antibody against the pan- leucocyte antigen, CD45 to identify leucocytes (non-tumor cells); a cell type specific or nucleic acid dye which allows exclusion of residual red blood cells, platelets and other non-nucleated events; and 3) a biospecific reagent or antibody directed against cytokeratin or an antibody having specificity for an EpCAM epitope which differs from that used to immunomagnetically select the cells.
  • Antibodies used for the capture were selected based on initial testing with tissue cultured tumor cells. The strategy was to select a cross section of cells lines which represent various differentiation statuses because expression levels change in accordance to differentiation status. Data suggests most primary site cell lines are poorly differentiated while ascites and metastases- derived cell lines are moderate to well-differentiated. Thus, BxPC3 (moderate), Panc-1 (Poor), CAPAN-1 (Well) and CAPAN-2 (Well) tumor cells were selected for antibody evaluation based on differentiation status. EpCAM., Mucinl, Mesothelin, Claudin-4, EGFR1 and CEACAM6 were determined to be targets for the capture antigens.
  • FIG. 1 (A) shows the staining intensity of cells with various markers which indicate expression levels.
  • Figure 1 (B) shows the percentage of positive cells with the markers.
  • CEACAM6 which appears to be highly prevalent in granulocyte and in monocytes to a lesser degree. This result would exclude the use of CECAM6 as a capture target for this assay. Based on the above data, EpCAM, Mucinl, Mesothelin, Claudin-4 and EGFR antigens are good targets for the capture of tumor cells. Detection Targets:
  • Antibodies for various markers were tested for the detection of tumor cells.
  • the markers tested were cytokeratins 7, 8, 17, 18, 19 and c-Src. These markers were tested at a concentration of 2 ug/ml by flow cytometry and across all four cell lines.
  • Figure 2(A) and Figure 2(B) summarize these results.
  • the cytokeratin family was ubiquitously expressed in all cell lines (79% to 100% of the population was positive for at least one of the targets).
  • the c-Src family was also expressed in all cell lines tested with varying expression levels (66% to 100% positive population). Across the board, all the cytokeratin antibodies worked equally well with comparable staining patterns and results.
  • cytokeratin 17 and anti-c-Src were positive on white blood cells (monocytes and granulocytes). Based on this data, cytokeratins 7, 8, 18, and 19 were selected to use as cocktail detection antibodies.
  • Anti-EpCAM antibody was used in all combinations.
  • Anti-cytokeratin (C 1 1 antibody which recognizes cytokertin 8 and 18), anti-cytokeratin 7, anti-cytokeratin 18 and anti-cytokeratin 19 were conjugated to PE using Veridex LLC
  • the method of analysis of the enriched tumor cell population will depend on the intended use of the invention.
  • the numbers of circulating epithelial cells can be very low. In that case, microscopy based analyses may prove to be the most accurate.
  • Such examination might also include examination of morphology, identification of known tumor markers and or oncogenes.
  • an analytical method which enumerates such cells should be sufficient. The determination of patient status according to the methods described herein is made based on a statistical average of the number of circulating rare cells present in the normal population.
  • Levels of circulating epithelial cells in the early stage cancer patient and in patients with aggressive metastatic cancer can also be statistically determined as set forth herein.
  • the kit starts with reagents, devices and methodology for enriching tumor cells from whole blood.
  • the kit would contain reagents to test for breast cancer cells in a blood sample which will assess six factors or indicators.
  • the analytical platform needs to be configured such that the reporter molecules DAPI, CY2, CY3, CY3.5, CY5, and CY5.5 will be discriminated by the appropriate excitation and emission filters.
  • the analytical platform in this example uses a fluorescent microscope equipped with a mercury arc lamp, and the appropriate filter sets for assessing the wavelengths of the detection labels employed. All of the markers are introduced at one time with this method.
  • the present invention improves upon the CellSearch Epithelial Cell Kit (Veridex, LLC).
  • Several combinations of polyspecific ferrofluid and cocktail detection reagents are included in the present invention to create various kit configurations.
  • the main improvement is incorporated in the in the capture and detection reagent components.
  • the different kit configurations are as follows:
  • Kit #1 CellSearch Epithelial Cell Kit as a control: EpCAM for capture; CI 1 (CK8, 18) and CK 19 for detection.
  • EpCAM/EGFR/Muc-1 E29
  • CI 1 CK8, 18
  • CK19 CD7 + CD 18 for detection.
  • EpCAM/Muc-1 E29
  • Claudin4 Claudin4 for capture
  • CI 1 CK8, 18
  • CK19 + CK7 + CK18 for detection.
  • pancreatic tumor cells BxPC3 and CAP AN- 1 cell lines
  • the samples were processed on the CellTracks AutoPrep and analyzed on the CellTracks Analyzer II.
  • Examples of different types of cancer that may be detected using the compositions, methods and kits of the present invention include apudoma, choristoma, branchioma, malignant carcinoid syndrome, carcinoid heart disease, carcinoma e.g., Walker, basal cell, basosquamous, Brown-Pearce, ductal, Ehrlich tumor, in situ, Krebs 2, merkel cell, mucinous, non-small cell lung, oat cell, papillary, scirrhous, bronchiolar, bronchogenic, squamous cell and transitional cell reticuloendotheliosis, melanoma, chondroblastoma, chondroma, chondrosarcoma, fibroma, fibrosarcoma, giant cell tumors, histiocytoma, lipoma, liposarcoma, mesothelioma, myxoma, myxosarcoma, osteoma, osteosarcom
  • lymphangiosarcoma myosarcoma, myxosarcoma, ovarian carcinoma, rhabdomyosarcoma, sarcoma (Kaposi's, and mast-cell), neoplasms (e.g., bone, digestive system, colorectal, liver, pancreatic, pituitary, testicular, orbital, head and neck, central nervous system, acoustic, pelvic, respiratory tract, and urogenital), neurofibromatosis, and cervical dysplasia.
  • neoplasms e.g., bone, digestive system, colorectal, liver, pancreatic, pituitary, testicular, orbital, head and neck, central nervous system, acoustic, pelvic, respiratory tract, and urogenital
  • neurofibromatosis e.g., cervical dysplasia.
  • the present invention is not limited to the detection of circulating epithelial cells only. Endothelial cells have been observed in the blood of patients having a myocardial infarction. Endothelial cells, myocardial cells, and virally infected cells, like epithelial cells, have cell type specific determinants recognized by available monoclonal antibodies. Accordingly, the methods and the kits of the invention may be adapted to detect such circulating endothelial cells.
  • the invention allows for the detection of bacterial cell load in the peripheral blood of patients with infectious disease, who may also be assessed using the compositions, methods and kits of the invention.

Abstract

L'invention porte sur un essai hautement sensible qui combine un enrichissement immunomagnétique avec une cytométrie par écoulement ou image multi-paramètres pour détecter, énumérer et caractériser des cellules du carcinome dans le sang. La présente invention comprend la conjugaison de différents anticorps au même ferrofluide. Ceci a pour effet de rendre le ferrofluide polyspécifique par rapport aux antigènes que le ferrofluide liera. Les multiples anticorps présents sur le même ferrofluide ne semblent pas se bloquer les uns les autres ou autrement s'interférer les uns avec les autres. De tels ferrofluides ont l'effet hautement souhaitable d'être aptes à se lier spécifiquement à plus d'un type de cellule. L'essai est particulièrement utile pour permettre la capture de cellules tumorales circulantes (CTC) qui ont une faible expression d'EpCAM, mais une haute expression d'autres marqueurs tumoraux. Par conséquent, l'essai facilite la caractérisation biologique et la stadification de cellules du carcinome.
EP11778732.5A 2010-10-14 2011-10-13 Procédés et trousses pour la détection de cellules tumorales circulantes chez des patients pancréatiques à l'aide de réactifs polyspécifiques de capture et de détection de cocktail Not-in-force EP2628008B1 (fr)

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US39303610P 2010-10-14 2010-10-14
PCT/US2011/056100 WO2012051390A1 (fr) 2010-10-14 2011-10-13 Procédés et trousses pour la détection de cellules tumorales circulantes chez des patients pancréatiques à l'aide de réactifs polyspécifiques de capture et de détection de cocktail

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EP2628008A1 true EP2628008A1 (fr) 2013-08-21
EP2628008B1 EP2628008B1 (fr) 2017-05-31

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US (1) US20120094275A1 (fr)
EP (1) EP2628008B1 (fr)
JP (1) JP5960146B2 (fr)
KR (1) KR20130119933A (fr)
CN (1) CN103154740B (fr)
BR (1) BR112013009008A2 (fr)
CA (1) CA2814528A1 (fr)
ES (1) ES2634220T3 (fr)
IL (1) IL225646A0 (fr)
MX (1) MX347964B (fr)
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CN103154740B (zh) 2016-08-03
CA2814528A1 (fr) 2012-04-19
MX347964B (es) 2017-05-18
CN103154740A (zh) 2013-06-12
KR20130119933A (ko) 2013-11-01
WO2012051390A1 (fr) 2012-04-19
ES2634220T3 (es) 2017-09-27
JP2013539868A (ja) 2013-10-28
TWI577389B (zh) 2017-04-11
JP5960146B2 (ja) 2016-08-02
TW201225978A (en) 2012-07-01
IL225646A0 (en) 2013-06-27
US20120094275A1 (en) 2012-04-19
BR112013009008A2 (pt) 2017-10-17
MX2013004172A (es) 2013-12-12
EP2628008B1 (fr) 2017-05-31

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